Google's official Inbox app is an email app that organises your inbox based on the types of email (spam, promotions, personal etc) you receive. It also has 'remind me later' type of functionality that the Mailbox app has.

-5 invites to Google's new Inbox app.
-No PMs.
-Need gmail.
-Give Rep+like when you apply and feedback after you receive it.

Will keep this GA short and prioritize the ones who didn't got an invite in the previous giveaways. Therefore mention if you've applied before